How do I call the current category, address and location on my meta tags (1 post)

I am on an event page for example http://www.eventsmaster.net/events/?event=west-side-story , I want to call the current category, current address and current location on the meta tag section, how can I can do that? attached, you will find the code and I want to replace the current_events_category, current_events_address and current_events_location by the right function/variable.